All flights______, we decided to take a greyhound.

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问题 All flights______, we decided to take a greyhound.

选项 A、were canceled
B、had been canceled
C、having canceled
D、having been canceled

答案D

解析 本题考查独立主格结构。逗号后没有连词提示,本空应填非谓语动词,故首先排除[A]项和[B]项。空所在部分的逻辑主语为All nights,而句子的主语是we,因此是考查独立主格结构。nights与cancel之间为被动关系,故选[D]项,因而排除[C]项。
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